Select Connect with Square, then log in with your Square username and password. Click Allow on the permissions page that comes up next. This is allowing Square and WooCommerce to connect to each other.

Select That’s my site - redirect me when prompted by the authentication screen.

Once your account is authenticated, fill out the remainder of the fields in the Authentication tab (such as business location and notification email).

Finally, be sure to enable Square as your payment option: go to the Checkout tab and click Enable.